The latest, 191.07 IIRC.
Crysis has no refresh rate settings, not even in the cvars (command console).
My earlier attempts at finding info on this, by googling things like "crysis refresh rate hdmi" and similar, were fruitless... but now I'm googling "dx10 refresh rate" and finding loads of relevant info. Seems there's a lot of people with DX10 refresh rate problems, and not just in Crysis.